Surface plasmon resonance-enhanced dielectric polarization endows coral-like Co@CoO nanostructures with good electromagnetic wave absorption performance

Shu, Yuan; Zhao, Tingkai; Li, Xianghong; Liu, Yang; Cao, Shuqing; Ahmad, Adnan; Jiang, Tao; Luo, Huijun; Jing, Zhuangmiao; Ain, Noor UI

doi:10.1016/j.apsusc.2022.152704

Cited by 33 publications

(14 citation statements)

References 58 publications

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“…In addition to the conduction loss, the polarization loss, including dipole polarization and interface polarization loss, produces a huge enhancement effect, which is further confirmed by the semicircles in the ε′ versus ε″ curves shown in Figure S6a−c. 64,65 Comparatively, it can be found that several Cole−Cole semicircles exist in the ε′ versus ε″ curves of the three composites, which all correspond to the dipole polarization loss caused by defects and dipoles such as C−N and C−O bonds. These irregular semicircles point out that the enhanced polarization loss can be attributed to strong interfacial polarization induced by the heterogeneous interface.…”

Section: ■ Results and Discussionmentioning

confidence: 91%

In Situ Derived Porous CoNi@Mo₂C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

Wen

Yang

Wang

et al. 2022

Crystal Growth & Design

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To meet the requirement of intense electromagnetic wave absorption capacity, a rational electronic regulation mechanism of magnetic metals is implemented. In this work, the heterogeneous structures containing Mo2C, metal alloys, and carbon nanotubes were synthesized by the deposition and carbonization of melamine. In contrast to single metallic elemental regulation, the electronic structure of Mo2C is obviously shifted by bimetallic regulation, which results in strong polarization relaxation in the electromagnetic field. Herein, benefiting from the tunable electronic structure between the Mo2C and CoNi, the CoNi@Mo2C-CNT composites exhibited strong interfacial polarization loss at high frequencies as well as excellent electromagnetic wave absorption performance with an effective absorption bandwidth of 5.9 GHz (2.1 mm) and a minimum reflection loss of −49.7 dB. These results indicate that the metal and Mo2C heterostructure can be synthesized successfully and that the electronic binding adjustment enhances the interface polarization loss.

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Section: ■ Results and Discussionmentioning

confidence: 91%

In Situ Derived Porous CoNi@Mo₂C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

Wen

Yang

Wang

et al. 2022

Crystal Growth & Design

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“…This improvement in efficiency can be attributed to the porous coral-shaped nanostructure of FeNi-CNC-800, which facilitates rapid oxygen diffusion and electrolyte penetration to the catalytic centers on FeNi alloy nanoparticles. 46 The small gap in voltage between the charge and discharge profiles of the FeNi-CNC-800-based battery suggests its excellent rechargeability (Figure 4d). 47 As exhibited in Figure 4e, the FeNi-CNC-800-based zinc-air battery also presents a better rate performance than the commercial Pt/C air electrode.…”

Section: Resultsmentioning

confidence: 98%

“…The maximum power density of FeNi-CNC-800 is 115 mW cm –2 , manifesting 1.85-fold higher than that of the commercial Pt/C catalyst (62 mW cm –2 ). This improvement in efficiency can be attributed to the porous coral-shaped nanostructure of FeNi-CNC-800, which facilitates rapid oxygen diffusion and electrolyte penetration to the catalytic centers on FeNi alloy nanoparticles . The small gap in voltage between the charge and discharge profiles of the FeNi-CNC-800-based battery suggests its excellent rechargeability (Figure d) .…”

Section: Resultsmentioning

confidence: 99%

Bimetallic-Coordinated Covalent Triazine Framework-Derived FeNi Alloy Nanoparticle-Decorated Coral-Like Nanocarbons for Oxygen Electrocatalysis

Li,

Lv,

Zheng

et al. 2023

ACS Appl. Mater. Interfaces

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It is highly desirable to fabricate transition bimetallic alloy-embedded porous nanocarbons with a unique nanoarchitecture for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in rechargeable zinc-air batteries. In this work, we introduce a template-assisted in situ alloying synthesis of FeNi alloy nanoparticle-decorated coral-like nanocarbons (FeNi-CNCs) as efficient OER/ORR dual-functional electrocatalysts. The present materials are produced through polycondensation of a covalent triazine framework (CTF), the coordination of Ni and Fe ions, and sequential pyrolytic treatment. Through the pyrolysis process, the nanolamellar FeNi-CTF precursors can be facilely converted into FeNi alloy nanoparticle-decorated nanocarbons. These nanocarbons possess a distinctive three-dimensional (3D) coral-like nanostructure, which is favorable for the transport of oxygen and the diffusion of electrolyte. As a result, FeNi-CNC-800 with the highest efficiency exhibited remarkable electrocatalytic performance and great durability. Additionally, it also can be assembled into rechargeable zinc-air batteries that can be assembled in both liquid and solid forms, offering a superior peak power density, large specific capacity, and outstanding reusability during charging/discharging cycles (e.g., 5160 charging-and-discharging cycles at 10 mA cm −2 for the liquid forms). These traits make it a highly promising option in the burgeoning field of wearable energy conversion.

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“…EM parameters, including complex permittivity (ε r = ε′ −jε″) and complex permeability (μ r = μ′−jμ″), determine the EM wave absorption performance [23,30,31]. From figure S3(a), the Mo 2 C@Co/C-10 and Mo 2 C@Co/C-15 composites exhibit higher ε′ values.…”

Section: Resultsmentioning

confidence: 99%

In situ construction of ZIF-67 derived Mo₂C@cobalt/carbon composites toward excellent electromagnetic wave absorption properties

et al. 2023

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Electromagnetic wave (EM) absorption materials with multi-loss mechanisms and optimized impedance matching have attracted considerable attention as a means to combat the ever-increasing electromagnetic pollution. Molybdenum carbide (Mo2C) with outstanding environmental stability and high conductivity is becoming popular as EM absorption materials. Herein, the CoMoO4@ZIF-67 precursor was synthesized by an in-situ sacrificial template method, followed by calcining to synthesize porous Mo2C@cobalt/carbon (Mo2C@Co/C) composites. The homogeneously dispersed Mo2C and Co nanoparticles as well as the porous structures resulted from the novel in-situ fabrication strategy could generate abundant interfaces and induce effective multi-loss mechanisms including polarization loss, conductivity loss, magnetic loss, and so on. The as-prepared optimal composite (Mo2C@Co/C-10) demonstrates superior electromagnetic (EM) wave absorption performance with a maximum reflection loss value of -37.9 dB at the matching thickness of 2.3 mm, and the effective absorption bandwidth (EAB) of 5.52 GHz was realized at 1.9 mm. The excellent EM wave absorption properties can be attributed to the good impedance matching, synergistic effects among different loss mechanisms, multiple reflection and scattering. This work not only developed an effective ternary EM absorption materials of Mo2C@Co/C, but also propose a facile in-situ strategy to fabricate more highly- dispersed mecarbide-basedased materials.

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Surface plasmon resonance-enhanced dielectric polarization endows coral-like Co@CoO nanostructures with good electromagnetic wave absorption performance

Cited by 33 publications

References 58 publications

In Situ Derived Porous CoNi@Mo₂C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

In Situ Derived Porous CoNi@Mo₂C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

Bimetallic-Coordinated Covalent Triazine Framework-Derived FeNi Alloy Nanoparticle-Decorated Coral-Like Nanocarbons for Oxygen Electrocatalysis

In situ construction of ZIF-67 derived Mo₂C@cobalt/carbon composites toward excellent electromagnetic wave absorption properties

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Surface plasmon resonance-enhanced dielectric polarization endows coral-like Co@CoO nanostructures with good electromagnetic wave absorption performance

Cited by 33 publications

References 58 publications

In Situ Derived Porous CoNi@Mo2C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

In Situ Derived Porous CoNi@Mo2C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

Bimetallic-Coordinated Covalent Triazine Framework-Derived FeNi Alloy Nanoparticle-Decorated Coral-Like Nanocarbons for Oxygen Electrocatalysis

In situ construction of ZIF-67 derived Mo2C@cobalt/carbon composites toward excellent electromagnetic wave absorption properties

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In Situ Derived Porous CoNi@Mo₂C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

In Situ Derived Porous CoNi@Mo₂C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

In situ construction of ZIF-67 derived Mo₂C@cobalt/carbon composites toward excellent electromagnetic wave absorption properties